SwimZip Fun Sun Play Wide Brim Sun Hat UPF 50+ SPF 50+ Material ... Blocks 98% of UVA and UVB Rays! (Called UPF 50+ for Sun Protection Fabric). 100% Polyester Wide Brim to Keep Sun Off the Face and Neck Quick Dry Material (PLEASE KEEP AWAY FROM SALT WATER AND HARSH DETERGENTS) Adjustable Tightener on the Back of the Hat and Under the Chin Great Accessory to Go With SwimZip's Sun Protection Rash Guard Swimsuit Sets